Soak tub



FIG. 1 is a perspective view of a soak tub embodying my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a rear elevational view thereof.

The broken lines are shown for illustrative purposes only. 

The ornamental design for a soak tub, as shown and described. 